<template>
    <div>
<!-- 面包屑导航区域 -->
<el-breadcrumb separator-class="el-icon-arrow-right">
     <el-breadcrumb-item :to="{ path: '/' }">首页</el-breadcrumb-item>
     <el-breadcrumb-item>权限管理</el-breadcrumb-item>
     <el-breadcrumb-item>角色列表</el-breadcrumb-item>
</el-breadcrumb>
<!-- 卡片视图 -->
<el-card>
    <el-row :gutter="10">
        <el-col :span="6">
            <el-button type="primary">添加角色</el-button>
        </el-col>
    </el-row>
    <!-- 角色列表区 -->
    <el-table
        :data="rolelist" border stripe>
        <!-- 展开列 -->
        <el-table-column type="expand">
            <template slot-scope="scope">
                <el-row :class="['bdbottom',i1 === 0 ? 'bdtop' : '','vcenter']" v-for="(item1, i1) in scope.row.children" :key="item1.id">
                <!-- 渲染一级权限 -->
                     <el-col :span="5">
                         <el-tag closable @close="removeRightById(scope.row,item1.id)">{{item1.authName}}</el-tag>
                         <i class="el-icon-caret-right"></i>
                     </el-col>
                <!-- 渲染二级权限 -->
                     <el-col :span="19">
                         <!-- 通过for循环 嵌套渲染二级权限 -->
                         <el-row :class="[i2===0 ? '': 'bdtop','vcenter']" v-for="(item2,i2) in item1.children" :key="item2.id">
                             <el-col :span="6">
                                 <el-tag closable @close="removeRightById(scope.row,item2.id)">{{item2.authName}}</el-tag>
                                 <i class="el-icon-caret-right"></i>
                             </el-col>
                             <!-- 渲染三级权限 -->
                             <el-col :span="18">
                                 <el-tag closable @close="removeRightById(scope.row,item3.id)" type="warning" v-for="item3 in item2.children" :key="item3.id">
                                     {{item3.authName}}
                                 </el-tag>
                             </el-col>
                         </el-row>
                     </el-col>
                </el-row>
            </template>
        </el-table-column>
        <!-- 索引列 -->
        <el-table-column type="index"></el-table-column>
        <el-table-column prop="roleName" label="角色名称"></el-table-column>
        <el-table-column prop="roleDesc" label="角色描述"></el-table-column>
        <el-table-column label="操作" width="300px">
            <template slot-scope="scope">
                <el-button type="primary" icon="el-icon-edit" size="mini">编辑</el-button>
                <el-button type="danger" icon="el-icon-delete" size="mini">删除</el-button>
                <el-button type="warning" icon="el-icon-setting" size="mini" @click="showSetRightDialog(scope.row)">分配权限</el-button>
            </template>
        </el-table-column>
    </el-table>
</el-card>
<!-- 分配权限对话框 -->
<el-dialog
  title="分配权限"
  :visible.sync="setRightDialogVisible"
  width="50%"
  @close="setRightDialogClosed">
  <!-- 树形空间 -->
  <el-tree show-checkbox node-key="id" default-expand-all :default-checked-keys="defKeys" :data="rightslist" :props="treeProps" @node-click="handleNodeClick" ref= "treeRef"></el-tree>
  <span slot="footer" class="dialog-footer">
    <el-button @click="setRightDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="allotRights">确 定</el-button>
  </span>
</el-dialog>
    </div>
</template>

<script>
export default {
  data () {
    return {
    // 所有角色列表数据
      rolelist: [],
      //  控制分配权限的对话框的显示与隐藏
      setRightDialogVisible: false,
      rightslist: [],
      // 树形控件的属性绑定对象
      treeProps: {
        label: 'authName',
        children: 'children'
      },
      //   默认选中的Id值数组
      defKeys: [],
      // 当前即将分配权限的角色的id
      roleId: ''
    }
  },
  created () {
    this.getRolesList()
  },
  methods: {
    // 获取所有角色的列表
    async getRolesList () {
      const { data: res } = await this.$http.get('roles')
      if (res.meta.status !== 200) {
        return this.$message.error('获取角色列表失败')
      }
      this.rolelist = res.data
      console.log(this.rolelist)
    },
    // 根据Id删除对应的权限
    async removeRightById (role, rightId) {
    // 弹框提示用户是否删除
      const confirmResult = await this.$confirm('此操作将永久删除该文件, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning',
        center: true
      }).catch(err => err)
      if (confirmResult !== 'confirm') {
        return this.$message.error('取消了删除')
      }
      //   console.log('确认了删除')
      const { data: res } = await this.$http.delete(`roles/${role.id}/rights/${rightId}`)
      if (res.meta.status !== 200) {
        return this.$message.error('删除权限失败！')
      }
      //   this.getRolesList()使用这个方法会导致页面刷新，导致用户体验差可以直接赋值给role.children
      role.children = res.data
    },
    // 分配权限的对话框
    async showSetRightDialog (role) {
      this.roleId = role.id
      //   获取所有权限
      const { data: res } = await this.$http.get('rights/tree')
      if (res.meta.status !== 200) {
        return this.$message.error('获取权限数据失败')
      }
      // 把获取到的权限数据保存到data中
      this.rightslist = res.data
      console.log(this.rightslist)
      //   递归获取三级节点的Id
      this.getLeafKeys(role, this.defKeys)
      this.setRightDialogVisible = true
    },
    // 通过递归的形式，获得角色下所有三级权限的id，并保存到defKeys
    getLeafKeys (node, arr) {
    // 如果当前node节点不包括children属性，则是三级节点
      if (!node.children) {
        return arr.push(node.id)
      }
      node.children.forEach(item =>
        this.getLeafKeys(item, arr))
    },
    setRightDialogClosed () {
      this.defKeys = []
    },
    // 点击为角色分配权限
    async allotRights () {
      const keys = [
        //   扩展函数来将获得的数据放在数组中
        ...this.$refs.treeRef.getCheckedKeys(),
        ...this.$refs.treeRef.getHalfCheckedNodes()
      ]
      const idStr = keys.join(',')
      const { data: res } = await this.$http.post(`roles/${this.roleId}/rights`, { rids: idStr })
      if (res.meta.status !== 200) {
        return this.$message.error('分配权限失败')
      }
      this.$message.success('分配权限成功')
      this.getRolesList()
      this.setRightDialogVisible = false
    }
  }
}
</script>

<style lang="less" scoped>
.el-tag{
    margin:7px;
}
.bdtop{
    border-top:1px solid #eee;
}
.bdbottom{
    border-bottom:1px solid #eee;
}
.vcenter{
    display: flex;
    align-items: center;
}
</style>
